<template>
	<view>
    <!-- 使用 自定义组件-->
    <my-search @click='gotoSearch'></my-search>
		 <view class="scroll-view-container">
		      <!-- 左侧的滚动视图区域 -->
		      <scroll-view class="left-scroll-view" scroll-y='true' :style="{height: wh + 'px'}">
            <block v-for="(item,i) in castList" :key="i">
		        <view :class="['left-scroll-view-item',i===active?'active':''] " @click="activeChanged(i)">{{item.cat_name}}</view>
            </block>
		      </scroll-view>
		      <!-- 右侧的滚动视图区域 -->
		      <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
		      <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key='i2'>
             <!-- 二级分类标题 -->
		      <view class="cate-lv2-title">
		        /{{item2.cat_name}}/
		      </view>
          <!-- 三级分类的渲染 -->
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
               <!-- 图片 -->
               <image :src="item3.cat_icon"></image>
               <!-- 文本 -->
               <text>{{item3.cat_name}}</text>
            </view>
          </view>
		     </view>
		      </scroll-view>
		    </view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
        //当前设备可用高度
				wh:0,
        castList:[],
        active:0,
        //二级分类
        cateLevel2:[],
        scrollTop:0
			};
		},
    onLoad(){
      const sysInfo=uni.getSystemInfoSync()
      this.wh=sysInfo.windowHeight-50
      this.getCateList()
    },
    methods:{
      //获取分类列表
     async getCateList(){
        const {data:res} = await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status!==200) return uni.$showMsg()
        this.castList=res.message
        this.cateLevel2=res.message[0].children
      },
      activeChanged(i){
        this.active=i
        //重新为二级分类赋值
         this.cateLevel2=this.castList[i].children
         //解决切换以及分类重置滚动条
         this.scrollTop=this.scrollTop===0?1:0
      },
      // 跳转到商品列表页面
      gotoGoodsList(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
        })
      },
      //跳转到搜索页面
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
	}
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  .left-scroll-view{
    width: 120px;
    .left-scroll-view-item{
      background-color: #f7f7f7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      &.active{
        background-color: #fff;
        position: relative;
        &::before{
          content: " ";
          display: block;
          width: 3px;
          height: 30px;
          background-color: #025599;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }

.cate-lv2-title{
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list{
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-item{
    width: 33.33%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom:10px;
    image{
      width: 60px;
      height: 60px;
    }
    text{
      font-size: 12px;
    }
  }
}
}

</style>
